【M-FOUR DSP + M-FOUR (Two Units) 8ch Specification | A DSP Amplifier System That Refines Sound from the Ground Up While Keeping the OEM Navigation】

Keep the OEM navigation and OEM head unit as they are, but want to fine-tune the sound in the cabin a bit more. You’d like to upgrade the system not only for the front speakers, but also including the rear and subwoofer.

That’s where the 8ch specification combining the M-FOUR DSP and M-FOUR is a good fit.

Tune the sound balance with the DSP, and drive it with extra headroom using an additional amplifier

With the M-FOUR DSP, you can finely adjust the balance of the audio sent to each speaker.

In the car, the distance from each speaker to your ears and the mounting positions differ between left and right, so the sound doesn’t necessarily come together naturally as-is. By using tools such as time alignment, an equalizer, and a crossover—adjusted to match the cabin—you can align the vocal positioning, the spread of instruments, and the connection with the bass.

By adding another M-FOUR alongside it, the system can handle the number of channels and output that a 4ch DSP amplifier alone can’t cover. This makes it easier to build a system tailored to your speaker configuration, such as front, rear, and subwoofer.

The strength of this combination is that it helps prevent the sound from feeling cramped not only when you turn the volume up, but also at normal listening levels—making it easier to follow the fine details in the music you listen to every day.

Easy to build even in a compact vehicle cabin

In general, when putting together a multi-channel system, you’ll be concerned about the number of amplifiers and available installation space.

The M-FOUR DSP and M-FOUR are compact-sized amplifiers that are easy to integrate even into limited cabin space, so they provide a configuration that makes it easier to consider installation locations such as the trunk or under the seats—based on your vehicle.

However, the actual mounting positions and wiring methods vary depending on the vehicle model and the OEM system. It’s important not to force components into tight spaces, but to install them while considering heat dissipation, serviceability, and even the overall appearance.

Upgrade the sound while preserving the OEM usability

Another appeal of this setup is that you can upgrade the audio portion without losing the operability of the OEM navigation or the vehicle’s functions.

It’s also ideal for people who want to improve only the sound without replacing the navigation with an aftermarket unit, and without changing the current atmosphere inside the cabin. After confirming the specifications of the OEM system and the audio signal on the vehicle side, you’ll determine where modifications should be made.

Even when using the same amplifiers, the final result varies depending on the combination with speakers, channel assignments, crossover settings, and the adjustments to suit the cabin. If it were me, I wouldn’t decide purely based on equipment combinations from the start—I’d ask what kind of music you normally listen to and which sounds you want to prioritize, then plan the configuration accordingly.

Recommended for people like you

• Want to improve sound quality while keeping the OEM navigation
• Want to drive the front speakers properly using multi-connection
• Want to tune the rear speakers and subwoofer as well
• Are considering future system expansion
• Want a clean setup without placing many amplifiers
• Want to fine-tune not just volume, but also imaging and overall sound coherence

The M-FOUR DSP + M-FOUR 8ch specification is not simply a configuration that adds amplifiers. It’s a system designed to smoothly drive the necessary speakers while shaping the sound to match your vehicle.

The best way to use it depends on your vehicle model, the specifications of the OEM audio, and your current speaker setup. Let’s organize everything together while checking your vehicle as you decide which speakers to play on which channels—and, if adding components, where to begin.

■ Main Specifications / Specs

【Configuration】
Product configuration: M-FOUR DSP + M-FOUR
System specification: 8ch configuration
Product type: DSP built-in amplifier + power amplifier

【Adjustment Functions】
DSP built-in: Yes
Time alignment: Yes
Equalizer adjustment: Yes
Crossover adjustment: Yes

【System Expansion】
Supports multi-channel systems matched to your vehicle and speaker configuration, such as front, rear, and subwoofer

※ Actual compatibility, channel configuration, mounting method, and the input/output to be used will be provided after confirming your vehicle’s OEM audio specifications and the current system.